| 1 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Mar 2025 |
| 2 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jan 2025 |
| 3 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 4 | Edwards Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 5 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 6 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2010 |
| 7 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 8 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jan 2025 |
| 9 | Energy Onramp LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 10 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 11 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 12 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 13 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 14 | Eqt Production Texas, LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Jun 2018 |
| 15 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 16 | Eureka Gas Co, Inc | Pikeville, KY 41502 | Gas Operator | Dec 2009 |
| 17 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 18 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 19 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 20 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 21 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 22 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |